Mailman 3 December 2005 - Twisted-web

lightweight forms thing for use with athena ???
by Paul Reznicek 12 Dec '05

12 Dec '05

glyph wrote: > Yep. I predict that will be happening soon - as soon as we manage to fix > the athena/FF15 bugs and do some more testing with IE, as well as come up with > *a lightweight forms thing for use with athena.* Hi ALL Nevow/Athena designers and fans, "lightweight forms for use with athena" is exactly what I was looking for while I've started playing with athena yesterday! I'm looking for a solution to replace formless.annotate.XX with a live version of forms, whereby among other things: - required fields labels are *bold* as long as they are empty or with wrong content and after leaving the input field, the label change accordingly - value checked input's labels are *red* as long as the entered value did not match the allowed range of values (+ there could be a live usage hint, displayed only during the input has wrong/missing value) - the fire (submit) button is disabled as long as the form is not complete [+ maybe change the value from _('Please fill all necessary fields') to _('Process') depending on form status] - there can be more buttons with special functions, i.ex.: date manipulation (now | +/- day/month/year) for date entry fields and lot of others - and of course all of this usable together with i18n part of Nevow, so that the messages and labels are in the user's selected language ... Is there any kind of work on this target? - yes: I'd like to join to share and push the efforts! - not: Is somebody looking for the same, so it make sense to publish partial results of my work? Paul

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How to kill the session
by Alberto Trujillo 07 Dec '05

07 Dec '05

Hello everybody: There is any way to kill all the session in Nevow? I mean, I'm loading a lot of variables in the session, and some times I need to get the session clear again, and it's very tedious set each variable to None. So if I coud kill all the session just with one sentences, or get a new one clean than replace the existing one, would be very helpfull for me. Thank you very much.

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How to wait for a deferred object?
by Suet Lung Cheung 05 Dec '05

05 Dec '05

Hi everyone, I am writing a TCP server program using twisted. I cannot use pb since the client side is not in python. I decided to use twisted.application and run it as internet.TCPServer(...). My problem is that I want to make it save something to a database whenever a connection closed. I do this in returning a deferred under Protocol.connectionLost(). I would like to make this work when the server is shut down. However when the server is down, it doesn't wait for the deferred to finish the callback and quit. I would like to make it save to db as normal but the server will wait for all deferred has called back. Is there anyway I can do this? Any suggestions? Thanks a lot Snow Dragon _______________________________________ �x��ӍϢ - Yahoo! Messenger ��]��ϾW��Կ��ӍϢ�o�㣬��ϾW�r��κ��fԒ��ʧ�� http://messenger.yahoo.com.hk

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Re: Athena Forms Thing
by Paul Reznicek 05 Dec '05

05 Dec '05

Doug Winter wrote: > ... > Dialtone is right to suggest using mg's form library I think, and I'm up > for doing some hacking on this this weekend. ... After testing Matt's "forms" I agree 100% that (except the AJAX features), forms are capable for very sophisticated designs! Your proposal on: http://forms-project.pollenation.net/cgi-bin/trac.cgi/wiki/ajax is qualified too - this functionality could be a real base for high interactive user interfaces. After getting your ajax-forms branch with: svn checkout svn://pollenation.net/forms/branches/ajax-forms ajax-forms I found your's first example - but not working too much. I was playing a bit with it and attached is a patch how to get on the server-side some more live into it. Looking forward the next steps !!! Paul Index: aforms/event.py =================================================================== --- aforms/event.py (Revision 147) +++ aforms/event.py (Arbeitskopie) @@ -21,7 +21,7 @@ def __init__(self, event, method, *args): self.event = event self.method = method - self.args = args + self.args = str(args)[2:-3] or '""' def render(self, ctx): - return "server.callRemote('%s')" % self.method + return "server.callRemote('%s', %s)" % (self.method, self.args) Index: aforms/examples/simple.py =================================================================== --- aforms/examples/simple.py (Revision 147) +++ aforms/examples/simple.py (Arbeitskopie) @@ -1,3 +1,4 @@ +#! /usr/bin/env python import pkg_resources pkg_resources.require("forms") @@ -4,6 +5,8 @@ from twisted.application import service from twisted.application import internet +from twisted.python import util +from twisted.internet import reactor from nevow import rend from nevow import athena @@ -20,20 +23,43 @@ ('baz', 'Baz'), ] +from zope.interface import Interface + +class ISimple(Interface): + def keypressed(): + pass + def blur(): + pass + def async_submitted(): + pass + +class Simple(object): + def keypressed(self, data): + print 'keypressed', data + def blur(self, data): + print 'blur', data + def async_submitted(self, data): + print 'async_submitted', data + reactor.stop() + class Page(forms.ResourceMixin, athena.LivePage): - docFactory = loaders.xmlfile("aforms/examples/simple.html") + docFactory = loaders.xmlfile( + util.sibpath(__file__, 'simple.html'), ignoreComment=True) def form_example(self, ctx): form = aforms.Form() + formIdPrefix = 'example' wf = forms.widgetFactory( aforms.TextArea, events=( - aforms.CallRemote('onkeyup', 'keypressed'), - aforms.CallRemote('onblur', 'blur', 23), + aforms.CallRemote('onkeyup', 'keypressed', 'this.value'), + aforms.CallRemote('onblur', 'blur', 'this.value'), ) ) - form.addField('aString', forms.String(), wf) - form.addAsyncAction(aforms.CallRemote('onclick', 'async_submitted')) + fieldName = 'aString' + form.addField(fieldName, forms.String(), wf) + form.addAsyncAction(aforms.CallRemote('onclick', 'async_submitted', + 'getValue("%s-%s")' % (formIdPrefix, fieldName) )) return form def submitted(self, ctx, form, data): @@ -44,11 +70,19 @@ return url.URL.fromString('/app') def child_app(self, ctx): - page = Page((), None) + page = Page(ISimple, Simple()) return page root = Root() application = service.Application("test") -i = internet.TCPServer(9898, appserver.NevowSite(root, logPath="/dev/null")) +i = internet.TCPServer(9898, appserver.NevowSite(root, ))# logPath="/dev/null")) i.setServiceParent(application) +# with this, you can start this file directly, no need for twistd ... +if __name__ == '__main__': + """Command Line Starter + """ + i.startService() + print 'SERVICE STARTED' + reactor.run() + print 'reactor STOPPED' Index: aforms/examples/simple.html =================================================================== --- aforms/examples/simple.html (Revision 147) +++ aforms/examples/simple.html (Arbeitskopie) @@ -5,6 +5,14 @@ <html xmlns:n="http://nevow.com/ns/nevow/0.1"> <head> <n:invisible n:render="liveglue" /> + <script type='text/javascript' language='javascript'> + // <![CDATA[ + function getValue(fieldID) { + return document.getElementById(fieldID).value; + } + // ]]> + </script> + </head> <body> <form n:render="form example" />

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Using deferreds to render a page
by A. Goryunov 05 Dec '05

05 Dec '05

I might be just dumb, but I can't figure out the correct way to do what the following passage from Twisted.web's Howto suggests: "/Request a |Deferred|, return |server.NOT_DONE_YET|, and call |request.write("stuff")| and |request.finish()| later, in a callback on the |Deferred|/." How do I get at the request object from a callback function? All the documentation on Deferreds that I managed to find uses print's to display results, but that doesn't help any, since I intend to present output to a remote user rather than myself. For now I've settled with using the following method: class PrintResult(object): def __init__(self, request): self.request = request def __call__(self, *args): l = args[0] if l: self.request.write("<html>ID is %s</html>" % str(l[0][0])) else: self.request.write( "<html>No ID found</html>") self.request.finish() return server.NOT_DONE_YET So that the request is stored inside the callback itself, but this somehow feels wrong. Is there some standard way of doing this that I am missing?

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Re: Athena Forms Thing [was: lightweight forms thing for use with athena ???]
by Paul Reznicek 05 Dec '05

05 Dec '05

Doug Winter wrote: > ... > Dialtone is right to suggest using mg's form library ... > Nice, and Doug convinced me to try Matt's "forms", especially because each input block (i.e. including it's label and required message) has it's own id and very sophisticated class combination, so it is predestined to go alive with athena ... When you get the current version from: svn://pollenation.net/forms/trunk and can not start the twistd -noy examples.tac try attached patch of forms/examples/main.py, it helped me ... Paul (P.S.: Sorry, Doug, I sent to wrong address before ...) Index: examples/main.py =================================================================== --- examples/main.py (Revision 140) +++ examples/main.py (Arbeitskopie) @@ -1,4 +1,7 @@ -import pkg_resources +try: + from pkg_resources import resource_filename +except ImportError: + from nevow.util import resource_filename from twisted.python import reflect from nevow import appserver, loaders, rend, static, tags as T, url import forms @@ -98,6 +101,6 @@ # Add child_ attributes -examples_css = pkg_resources.resource_filename('forms.examples', 'examples.css') +examples_css = resource_filename('forms.examples', 'examples.css') setattr(RootPage, 'child_examples.css', static.File(examples_css)) setattr(RootPage, 'child_forms.css', forms.defaultCSS)

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Error output for bad deferred method signatures?
by Lenny G Arbage 02 Dec '05

02 Dec '05

I'm curious why errors aren't reported when deferreds are fired if the deferred method has a bad signature. For example, if the following is run: import httplib, sys from twisted.web import client from twisted.internet import reactor, threads, defer from twisted.protocols import http from twisted.python import failure class getYahoo(object): def __init__(self): factory = client.HTTPClientFactory("http://www.yahoo.com") reactor.connectTCP("www.yahoo.com",80,factory) factory.deferred.addCallback(self._gotResponse, factory) factory.deferred.addErrback(self._errSendReq, factory) self.deferred = factory.deferred def _gotResponse(self, resp, factory): print "yeah!" print resp def _errSendReq(self, err, factory): print "shucks!" print err def sendRequest(): return getYahoo().deferred if __name__ == '__main__': def test(msg): print msg print respOrErr d = sendRequest() d.addCallback(test, "success") d.addErrback(test, "failure") reactor.run() The deferred _gotResponse() and _errSendReq() fire perfectly, but the test() function in __main__ is not called for "success" or "failure". This is expected as the signature is wrong -- it should be 'test(respOrErr, msg)'. What isn't clear [to me] is why this doesn't produce an error upon firing the deferred, but instead produces an error when the reactor shuts down [via ctrl-c], which could be hours later. I have an instance of this that is more severe, where the error output is *never* produced (maybe because of threading?). Is this the expected behavior, or am I doing something atrocious to produce it? Thanks, Lenny __________________________________ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/

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LivePage and Safari
by Beau Hartshorne 01 Dec '05

01 Dec '05

When I loaded up the Chatola demo, I noticed that Safari (2.0.2) was still "loading" the page. I sat there waiting for a few seconds before I realized that it would never stop because of the way the LivePage works. (Yes, I'm brand-new.) The first time, I clicked on Stop and of course nothing worked. To work around the problem, I included the LivePage code in the <head>, and added an onload handler to <body> to call connect(0). This didn't fix it, so I changed it to setTimeout('connect()', 1). That worked, Safari no longer tells the user that it's waiting for the page to load. This seems like a Safari bug, but would it make sense to patch the Nevow code with this work-around? Where do you get started to submit a change like this? Thanks! Beau

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Strange crash with custom resource code
by Matt Feifarek 01 Dec '05

01 Dec '05

I recently moved an existing twisted http app from Twisted 1.x to 2.1, and am having a strange traceback that I can't track down. My code renders jpeg images on-the-fly via a spawnProcess() on the reactor. It used to work fine, and it still seems to work (though very very slowly). I'm getting tons of tracebacks at the console that launched the reactor: Unhandled error in Deferred: Traceback (most recent call last): File "/usr/lib/python2.4/site-packages/twisted/internet/defer.py", line 294, in _startRunCallbacks self._runCallbacks() File "/usr/lib/python2.4/site-packages/twisted/internet/defer.py", line 307, in _runCallbacks self.result = callback(self.result, *args, **kw) File "/usr/lib/python2.4/site-packages/twisted/internet/defer.py", line 229, in callback self._startRunCallbacks(result) File "/usr/lib/python2.4/site-packages/twisted/internet/defer.py", line 294, in _startRunCallbacks self._runCallbacks() --- <exception caught here> --- File "/usr/lib/python2.4/site-packages/twisted/internet/defer.py", line 307, in _runCallbacks self.result = callback(self.result, *args, **kw) File "/usr/local/lib/python2.4/site-packages/Wrangler/render/image/__init__.py ", line 132, in postConvert_Success Inline_Generic.render_present( self, args[0] ) File "/usr/local/lib/python2.4/site-packages/Wrangler/render/generic.py", line 131, in render_present static.FileTransfer(f, size, request) File "/usr/lib/python2.4/site-packages/twisted/web/static.py", line 413, in __init__ request.registerProducer(self, 0) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 583, in registerProducer self.transport.registerProducer(producer, streaming) File "/usr/lib/python2.4/site-packages/twisted/internet/abstract.py", line 273, in registerProducer producer.resumeProducing() File "/usr/lib/python2.4/site-packages/twisted/python/hook.py", line 153, in newfunc return getattr(klass, ORIG(klass, name))(*args, **kw) File "/usr/lib/python2.4/site-packages/twisted/web/static.py", line 426, in resumeProducing self.request.finish() File "/usr/lib/python2.4/site-packages/twisted/web/server.py", line 265, in finish http.Request.finish(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 630, in finish self._cleanup() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 437, in _cleanup self.channel.requestDone(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 1058, in requestDone self.requests[0].noLongerQueued() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 468, in noLongerQueued self.transport.registerProducer(self.producer, self.streamingProducer) File "/usr/lib/python2.4/site-packages/twisted/internet/abstract.py", line 273, in registerProducer producer.resumeProducing() File "/usr/lib/python2.4/site-packages/twisted/python/hook.py", line 153, in newfunc return getattr(klass, ORIG(klass, name))(*args, **kw) File "/usr/lib/python2.4/site-packages/twisted/web/static.py", line 426, in resumeProducing self.request.finish() File "/usr/lib/python2.4/site-packages/twisted/web/server.py", line 265, in finish http.Request.finish(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 630, in finish self._cleanup() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 437, in _cleanup self.channel.requestDone(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 1058, in requestDone self.requests[0].noLongerQueued() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 468, in noLongerQueued self.transport.registerProducer(self.producer, self.streamingProducer) File "/usr/lib/python2.4/site-packages/twisted/internet/abstract.py", line 273, in registerProducer producer.resumeProducing() File "/usr/lib/python2.4/site-packages/twisted/python/hook.py", line 153, in newfunc return getattr(klass, ORIG(klass, name))(*args, **kw) File "/usr/lib/python2.4/site-packages/twisted/web/static.py", line 426, in resumeProducing self.request.finish() File "/usr/lib/python2.4/site-packages/twisted/web/server.py", line 265, in finish http.Request.finish(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 630, in finish self._cleanup() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 437, in _cleanup self.channel.requestDone(self) File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 1058, in requestDone self.requests[0].noLongerQueued() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 472, in noLongerQueued self._cleanup() File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 437, in _cleanup self.channel.requestDone(self) exceptions.AttributeError: Request instance has no attribute 'channel' Very little of that traceback refers to any of my own code, so I don't know how to begin digging in for what I've done wrong. My suspicion is that it's a matter of minor api changes in the Resource class, but I can't find any migration documentation on twistedmatrix.com. If anyone could give me a track to start my digging, I'd appreciate it. Thanks!

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Nevow Athena LiveFragment without allowedMethods
by Paul Reznicek 30 Nov '05

30 Nov '05

Hi JP & co., I've just started playing with current ATHENA - very nice !!! Is there any deeper security reason to use the "allowedMethods" mapping additionally to the simple fact, that a fragment implements a method only if it is necessary? If not, please consider to apply attached patch. It makes the code and use of it a little bit simpler. Thanks for your great work, best regards, Paul Reznicek Index: nevow/athena.py =================================================================== --- nevow/athena.py (Revision 3368) +++ nevow/athena.py (Arbeitskopie) @@ -407,20 +407,18 @@ <form onsubmit="Nevow.Athena.refByDOM(this).callRemote('foo', bar); return false;"> - By default, only methods named in the C{allowedMethods} mapping - may be invoked by the client. """ - allowedMethods = {} - def rend(self, context, data): myID = self.page.addLocalObject(self) context.fillSlots('nevow:athena_id', myID) return super(LiveFragment, self).rend(context, data) def locateMethod(self, ctx, methodName): - if methodName in self.allowedMethods: - return getattr(self, methodName) + if not methodName.startswith('_'): + method = getattr(self, methodName, None) + if method: + return method raise AttributeError(methodName) Index: examples/athenademo/athenatest.py =================================================================== --- examples/athenademo/athenatest.py (Revision 3368) +++ examples/athenademo/athenatest.py (Arbeitskopie) @@ -23,7 +23,6 @@ tags.form(action='#', onsubmit='return test(test_ClientToServerArgumentSerialization(this));')[ tags.input(type='submit', value='Test Client To Server Argument Serialization')]]) - allowedMethods = {'test': True} def test(self, i, f, s, l, d): self.assertEquals(i, 1) self.assertEquals(f, 1.5) @@ -65,7 +64,6 @@ tags.form(action='#', onsubmit='return test(test_ClientToServerResultSerialization(this));')[ tags.input(type='submit', value='Test Client To Server Result Serialization')]]) - allowedMethods = {'test': True} def test(self, i, f, s, l, d): return (i, f, s, l, d) @@ -104,7 +102,6 @@ tags.input(type='submit', value='Test Client To Server Asynchronous Exception Result')]]) - allowedMethods = {'testSync': True, 'testAsync': True} def testSync(self, s): raise Exception(s) @@ -135,7 +132,6 @@ tags.form(action='#', onsubmit='return test(test_ServerToClientArgumentSerialization(this));')[ tags.input(type='submit', value='Test Server To Client Argument Serialization')]]) - allowedMethods = {'test': True} def test(self): return self.page.callRemote('test_Reverse_ServerToClientArgumentSerialization', 1, 1.5, u'hello', {u'world': u'value'}); @@ -159,7 +155,6 @@ tags.form(action='#', onsubmit='return test(test_ServerToClientResultSerialization(this));')[ tags.input(type='submit', value='Test Server To Client Result Serialization')]]) - allowedMethods = {'test': True} def test(self): def cbResults(result): self.assertEquals(result[0], 1) Index: examples/athenademo/typeahead.py =================================================================== --- examples/athenademo/typeahead.py (Revision 3368) +++ examples/athenademo/typeahead.py (Arbeitskopie) @@ -20,7 +20,6 @@ class TypeAheadFieldFragment(athena.LiveFragment): docFactory = loaders.stan(T.input(type="text", id="typehere", **athena.liveFragmentID)) - allowedMethods = { 'loadDescription' : True } def loadDescription(self, typed): if typed == '': Index: examples/livefragments/livefrag.py =================================================================== --- examples/livefragments/livefrag.py (Revision 3368) +++ examples/livefragments/livefrag.py (Arbeitskopie) @@ -40,11 +40,10 @@ def __init__(self, label, *a, **kw): super(CooperativeFrag, self).__init__(*a, **kw) - self.allowedMethods = {label: True} setattr(self, label, lambda: unicode(label)) def render_submit(self, ctx, data): - return "submitIt(this, '%s'); return false;" % (self.allowedMethods.keys()[0],) + return "submitIt(this, 'label'); return false;" class Root(rend.Page): def child_(self, ctx):

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